[4.13][scale] all egressfirewalls will be updated on every node update

During an egress firewall bug verification we found that large egressfirewalls are taking longer than usual time to be applied.
In the logs we can see the same egressfirewall ACL is created more than once.
That happens when a node gets updated, because of a newly introduced feature for egressfirewall nodeSelector

1. Create any egressfirewall
2. check ovnk-master logs
oc logs -c ovnkube-master <leader pod> -n openshift-ovn-kubernetes | grep "egressFirewall:<egressfirewall namespace>" 
If no logs are printed, try "EgressFirewall:<egressfirewall namespace>" with the capital E
3. You should see N logs based on the number of egress firewall rules
4. label a node like
oc label node <any node> label=test
5. grep the same logs, there should be 2*N logs for creating and updating the same ACLs

no additional logs to update existing ACLs are generated